Besides simplifying element nesting, compact expression also provides a way to reference and reuse policy expressions.

除了简化元素嵌入，紧凑表达式也提供一种引用和重用策略表达式的方法。

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Simplicity: the code is more efficient and compact by using the single head element or type definition to select a group of elements.

简单性：通过使用单个head元素或类型定义来选择一组元素，使代码更加紧凑高效。

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Reasonably using a sphere-prism and its combination, optical system is changed small size, less weight, few element, compact structure and better imaginary quality.

合理使用球面棱镜及其组合可以使光电仪器尺寸小、重量轻、元件少、结构紧凑、成像质量好。

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The central element of that treaty, known as the fiscal compact, is something called a debt brake.

WSJ: Wonk Wars: How Big Are EU Deficits?

This premium lens features newly designed optics including an Advanced Aspherical (AA) glass element, which contributes to the camera's extremely compact dimensions without sacrificing optical performance.

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"It's very much about the fact that Ireland needs to see our currency stabilized, and the fiscal compact -- well, it's not a solution in itself, it's a hugely important element of a solution, and I think the Irish people see that very clearly, " she said.

CNN: Ireland's voters approve European fiscal treaty